How to ID NLA strips for appending elsewhere
Rename the action

You have given "catchy" names to the nla track and nla strip using your actions.  You want to rename your action.

Can be achieved via the UI 

In Dope sheet (or outliner) Ctrk left click the action name and rename

before pushing down




after pushing down


by putting the dope sheet into action editor mode and renaming



via the python console, example image below, the action "CubeAction" is renamed to "walk".